Translating device



Jan. 6, 1931.

w. H. HLUTTER 1,787,579

TRANSLATING DEVICE Filed Nov. 19, 1928 2 Sheets-Sheet 1 Jan. 6, 1931.- w. H. HUTTER 1 ,787,579

'I'RANSLATING DEVICE Filed Nov. 19. 1928 2 Sheets-Sheet 2 I fill? I May /165524113 ,7 mew M J A v Patented Jan. 6, 1931 I mummies; DEVICE 7 c Applicationjfiled I Tovember 1'9, iazsflseria No. 320,259.'

My invention relates to a tra'nslating de vice, and more particularly to a device for translating mechanical movements into electrical impulses such as used" in electrical phonographs.

An object ofthe invention ing sounds.

Alfurther lating device in' whichthej mover'nen't of a vibratory member is accurately and emciently converted into correlated electrical impulses, which may" be amplified and con verted'int'o sound Waves provide a trans- A further obJect is to lating device in whichthe vibratory member v v supporting the casing 16 and makes electrical contact with the terminal members 24. ,The; currents generatedin coil 2'1inay thus be ledx i' moving between the- .pole pieces of ajni'agnet is resiliently restrained: to, counterbalance the effect of the magnet upon-the movement ofthe vibratory member so that its entire movement will'be' due to mechanical causes A furtherobject is to provide anim proved mounting: for the vibratory member of a translating device. I 7

ther features and advantages of the ap[ paratus will appear as (the description pro ceedsQ,

In thedrawingsp Fig, 1 is'a side. elevation of a translating device tion; I

Fig. 2

show the interiorfof theTca'sing;

. Fig. 3 is an enla'rged longitudinal section taken on line ,3- 3 of Fig. 2;"

Fig. i-Yis a l-enlarged cross section of the device taken on lines elf-4: 1; Fi 2;; 7

Fi 5 ,is a longitudinal section taken on].

Fig dis an enlarged perspective .of apart oftheidevice; r i Fig. 7 is'a; perspective of the vibratory member; I I

mounting the vibratory member Fig. g8 isafperspective of' alspring for Fig.1.9 -is a perspective of the magnetic yokeyand 1 Fig. 10 is aw perspect ve of the double pole piece shown removed from the yoke.

g g to provide an improved translating device for reproduci Withinthe casing is a U-shaped magnet 18',

; preferably of the permanent magnet'itype;

to provide a traIiSQ I a ross the poles of which is a magnetic yoke embodyingthefeaturesof the inven-f o I relation byanon-magnetic support 3T5which 5 is (a front elevation of the device shownfin Fig. '1, with parts broknaway to {Referring to thefdrawings, in which the i same reference characters refer to similar 1 parts in the". several. views, a casing 16 shown .for enclosingthe translating device. The casing may bemade ofanysuitable'nonj- ,magnetic material such as aluininui n and is" WILLIAM r1. IHI-IUTTERLOF'RACINE," wrscoivs m assmuon To wEBsTERnLEcrnIc} providedwith a cover 17 of similar material.

l9 whichsurrounds a generating coi1'21 A terminal block 22 is mounted upon afsitud 2?] integral with the casing and carries a- 'plu? rality of'term'inal members 24, to whichthe ends of coil 21 are connectedjj A cord 25 passes through a tubular arm 26 through cord 25% a'suitable amplifying devlceand converted into sound waves.

The magnetic yoke comprises polepieces fpiece-s31 and 32 are interconnected byan in-' tegral connector 35 of magnetic material, and

pole pieces 33 and 34 are interconnected anxinte ral connector36 ofmagnetic mate V rial. T epole pieces are held in fixed spaced I,

maybe spot welded to thec'onnectors 35and 36v The non-magnetic supportholds the pole pieces-in such a position as to proyideasmall air gap betweenpole pieces 31-a'nd 33,'andfaf larger air gap between pole pieces scene 34.,

Mounted upon the support 37 is a vibratory! member or armature 38' having a plurality;

of knife edges 39, which engage'g'rooves 41-;

of the; support. The knife edges are 1 M the .groovesvby a spring 43"having alknife edge i4: which engages a surface e0 .injfan aperture 42 in the.armature,.the surface'flO' and knife edge l i' bei'ng -inalignmentfwithv the knife edges 39-so that the armature may pivot aboutithe knife edges with .a minimum-* offriction. Spring 43 is attached to the .maghetidyOke 19 by screws 45 thus forming] anjeflicient pivotal mounting for the arma-f;

' ture upon the' yoke, supporting the pivoted portion of the armature in the'gap between pole pieces 32 and 34. The free end 46 of the 7 armature is reduced in thickness and slightly The grooves 451 in the non-magneticl supi-jf port are'accurately located midway between the faces of pole pieces 32 and 34 andare cut 10 to jsucha depth thatthe axisof the pivot of of pole pieces 32 and 34. This construction maintains a uniform reluctance in the gaps between'the armature and pole pieces'32 and 34 as the armature is vibrated-sincethe averagelength of the, air gaps will be constant.

. Thereluctance of the air gaps between the freeiend of the armature, andpolepieces 31 aIidY 33, however, will varyi as the armature ,vibrates, since the distance of; the free end 7 of the armature from e ther o'tthe pole pieces varies as the armaturevlhrates, var ungthe length of 'theairfgap; f When end 46 or the armature approaches nearer pole piece 31;

than pole piece 33 the reluctance through pole piece 31, armature, 38 and pole piece 35 will beless than the reluctance through polepiece 32,,armature 38 and-pole piece 33, causing a magnetic lflux, to] pass through the armature in an: upward direction as viewed in Fig, 5. The movementiof the armature in; the other direction increases' the reluctance between polepiece 31 andjthe' armature'a'nd when'the end 46 6f the armaturef'is nearerfpole piece. 33;thanpole'piece .31, the reluctance of the 5 path from pole piece 32, through armature '38 .to pole piece 33. will be less'than the res luctance through pole piece 31, armature 38 andipolc piece 34, andthe direction of the magnetic. flux will .be in the opposite rdirec tion-from that in which it was when the armature was nearer pole. piece, 31. The vibration of the armature will therefore proarmature,

50, roundtool togive theme circular cross-sec duce. a corresponding variation in the lines of smagnetic fiux in, the armature, inducingiaj;

current in coil 21jwhose WflVQf rm willjbear a .gdefinite relation to {the vibrations of the,

rpoiep es a endsiwhich are formed fromtheend by a tionitherebyIadaptingjchemj to prevent mate hrial therein from working out si'dewise. {The osramateriak 18 fengaging'jthe free end 46 ,ofthej f armature to normallylinaintainfthe armatureg V in. theycentero of the, gap-"between: the f pole pieces .MQuhted.uponjea'ch of tl1c polef' slots, are-provided with a} piece of resilient pieces 3 lfand 33 isa'plate 51 having a tongue resilient material .48 in the slot,

Plate? 51' is provided with a 1ongimama1 slot..53, at one end whereof is a projection 5%1* 52; extending. into, slotA'? and engaging the resilient material in slot 47' against the free end of the armature. The cams 56'are provided with oil'set levers 57 which are accessible and may be; adjusted when the cover 17 V of the leasing. is removed. The "pole. pieces r the armature lies at, the center of the faces :31 and 33; attract v the" armature in accordance with the proximity of the armature to a pole piecef-but on account of the resilient material a force willbe applied to the armature 'tendin g to-return it to its central posit on which also increases with, the proximity of the armature to ,a-polej'piece so that theu magnetic attraction of the armature is coun terbalanced byfthe resilient material and therefore will notaffect the movement of the armature.

Astyhis .58, which is adapted ,to'makeicontact with a record, is adapted to be inserted into an 0penin'g 61 inthe armature,where it maybe firmlyfheld in-placeby turning a thumb screw 62jtoi grip thestylus.

Tlie operati'on} of the device is as follows:. When the -stylus passes over'agrecord otthe usual type, the undulations in thefrecord'will,

cause thestylusto vibrate, which movement s connnunicated to the armature 38, causmg the reducedend 46toreeipro'catebetween pivoted'on acenml line of the faces of pole ference of pole pieces 32 and 3 twill not affect the armature during; the vibration of the armature," VThelend 46fofthe armature will, however, approach 'and reeede from the pieces 32and-34, the magnetic potential dif- V pole pieces 31 and 33 which haveadifierent" magnetic otentials,. thereby "varyingthe magnetic ux throughcthe' armature and inducing a'currentin @1121; 1 c

p It will,begseen,,therefore, that the ma I l a netio, flu willivary throughjthe armature as Bland 333 haveslots7 'at-theirj"fthe' armature isf jreciprocated and whenever the centralposition'o ofthe far mature is passed, the/flux through the'armature will fiuX through; the armature generates a cur- I rent which is correlated to the movement ofthe armature and is adapted tovbe amplified fandm'converted. into sound by any "suitable "amplifying, and reproducing apparatus.

' One of the featuresofthe deviceIis-that onlythe movement of end 46-of thearmature V producesia variation of the flux throughthe 'armaturei The pivotal-mounting o'flthe armature between-thefpole pieces 32 and 34; at a point half-way between-the upper and lower pole pieces maintains the average air gap betweenthe armatnre and poles 32 and 34.- constant during the movement of the armature, .which results in greatly improved tone qualities when the electrical impulse generated are converted into sound.

Having, described the nature of my invention and the embodiments thereof, what I desire to secure by United States Letters Pat ent is as follows:

1. A reproducing device comprising a -permanent magnet, a coil, a magnetic bridge between the poles of the magnet and having a gap adjacent one side of. the coil, a second I magnetic bridge between the poles of the magnet and having a gap adjacent the other side of tne coil, a movable armature passing through the coil and the gaps in the magnetic bridges, a nonmagnetic mounting for said armature having a groove therein in which a portion of saidarmature has pivotal engagement and means for maintaining the magnetic reluctance between the armature and'one 0f the bridges constant and varying the mag" netic reluctance between the armature and the other bridge thereby inducing a current in the coil.

, 2. In a reproducing device, a magnet, a

coil, a yoke bridging the endsof the magnet and surrounding thecoilgcomprisinga pair of magnetic U-shaped members having their arms in alignment and a non-magnetic memer supporting the U-shaped members and holding their ends. in spaced relation, a vibratory armature pivotally mounted on the non-magnetic member in the plane of the arms of the U-shaped members on one side of the coil andextending into the gap between the arms on the other side of the coilwhereby V the vibrations of the armature induce a current in the coil.

3. In a-reproducing device, a coil, a yoke for the coil comprising a non-magnetic member having a groove, a pair of magnetic members attachedto the non-magnetic member and held in' spaced relation thereby, said magneticmembers extending from the center of the coil over the lateral side of the coil to the-center on the other side forming gaps between the ends ofthe magnetic members,

an armature having a knife edge support mounted in the groove of the non-magnetlc member in one of the gaps between the magnetic material, said armature extending through the coil and having a free end recip- 'rocable in the other gap. 7

4. In a reproducing device, a coil, a pair of pole pieces at each end of the coil having a gap therebetween, a magnet associated with the pole pieces, ,a non-magnetic mounting for an armature having a groovetherein,

an armature having aknifeedge extending Lhrough the gaps ln the pole pieces and p1vand means for moving the armature about its p1vot to generate a current in the coil.

5. In a reproducing device, a coil, a yoke having a groove surrounding the coil, an

armature having an opening 'therethrough,

one side of'whichf is in alignment with theknife edge, and a resilient blade attached to the yoke andpassing through the opening in the armature, said blade having a knife edge in alignment with the knife edge of the armature engaging the opening in the armature.

7 In a reproducing device, a mounting for an: armature having a groove therein, an armature havinga pair of aligned knife edges, resting in said groove,'a surface on said armature between said knife. edges and in aligns ment therewith and a member having a knife edge engaging said surface to retain the knife 7 edges of the armaturein the grooves forming a pivotal mountmg for the armature.

8. In a reproducing devlce, a mounting for an armature having a groove therein, an

armature having a knife edge pivotally engagingsaid groove, a surface on said armature in alignment with the knife edge, and a member having a knife edge engaging said surface to retain the knife edge of the armature in the groove. V

In witness whereof, I hereunto subscribe my name this 16th day of November, 1928.

' WILLIAM H. HUTTER.

ally.mountedintheqgap atone end of the coil by enga ementin said groove, the pivot point of sai armature being in the center of the faces of the pole pieces forming the gap 

